#include <iostream>
using namespace std;
class test
{
int x;
public:
test():x(10) {}
friend std::ostream& operator<< (std::ostream& o, test t)
{
o << t.x ;
return o;
}
};
int main() {
// your code goes here
test T;
std::cout << T;
return 0;
}
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